Here is the full list of all 30 Apotheon achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Beat game on Olympian Difficulty
Acquire the powers from all twelve Olympian Gods.
Acquire the Thunderbolt of Zeus
Find all lockboxes on Olympus.
Find all rare weapons on Olympus.
Root out the assassins in the Acropolis.
Access the Gold Mine in the Sea.
Access the sunken wreck of the Euphemia in the Sea.
Aquire the Sandals of Hermes.
Aquire the Artifice of Hephaestus.
Access the Merchant Stockpile in the Acropolis.
Access Apollo's nectar cellar.
Access the Symposium of the Sun in Apollo's hall.
Aquire the Cestus of Aphrodite.
Access the Refugee stash in the Forest.
Access the Secret Grove at the Shrine of the Nymphs.
Aquire the Kantharos of Dionysus.
Meet the Necromancer in Hades.
Access the Hunter's Trove in the Forest.
Access the Assassin Stash in the Swamps.
Ascend to Mount Olympus
Acquire the Aegis of Athena
Acquire the Crest of Ares
Access Kleio's gift in the Acropolis.
Acquire the Trident of Poseidon
Acquire the Lyre of Apollo
Acquire the Sheaf of Demeter
Access the Agora Armoury.
Access the Agora Market Scroll-keeper’s Office.
Acquire the Bow of Artemis